HW – How to Segregate Your Containers of Hazardous Waste

For compliance with federal and state regulations, and safety considerations of the college community, waste containers held for disposal or that are actively being filled must be properly segregated by chemical hazard class.

  • Go to the University of Minnesota Chemical Waste Registry Searchable Database where you will use the Drum Designation Code (DDC).
  • Type in either the Chemical Name or CAS (Chemical Abstract Services) Number and click on “Search.”   Typing the first few letters of the name will return matches from which you can choose.
  • In the Search Results, look under the “DDC” column.
    • The chemical hazard class is denoted in the first two digits of the DDC.  Only containers that possess the same general hazard class (e.g., combustible/flammables) can be stored in the same secondary containment tray.
      • Use this table to determine which combination of chemical groupings (DDCs) can be  stored in the same secondary containment tray.
  • Containers of incompatible chemicals must be physically segregated and cannot be placed in the same secondary containment tray.
  • The following substances must be isolated from other substances:
    • Concentrated nitric acid, which must not be placed in the same secondary containment trays as other acids.
    • Oxidizers cannot be placed in the same cabinets as flammables.
    • Water sensitive (“xxWS”) or shock sensitive (“xxSS”) wastes (these must also be further segregated by hazard class).
  • Containers of Chemical Mixtures are to be segregated by their primary hazard class.